JPS62107408A - Magnetic head core - Google Patents

Abstract

PURPOSE:To securely join a magnetic metallic material and nonmagnetic oxide joining material by interposing an oxide film layer consisting of a magnetic metallic material oxidized by an oxidation treatment except a heating treatment at the boundary faces between the two materials. CONSTITUTION:The oxide film layer 20 formed by oxidizing a thin magnetic metallic film 14 is interposed between the thin magnetic metallic film 14 and glass 16 of right and left half cores 11. The oxide film layer 20 is formed by plasma oxidation or chemical oxidation except the heating treatment. For example, the plasma oxidation is executed by forming the thin magnetic metallic film 14 on the surface 13 to be stuck with the thin film of the half core 11, then irradiating plasma onto the surface of the thin film 14 and subjecting the film to the treatment of the highest possible power, by which the impurities existing in the grain boundaries are removed and the oxide film layer 20 is formed to about 50-100Angstrom . The glass 16 is melted and packed between the oxide film layer 20 and the surface 15 for controlling the depth of the magnetic gap of the other half core 11, by which the right and left half cores 11 are joined. Since oxygen diffusion takes place between the oxide film layer 20 and the glass 16, the two materials are securely bound.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a magnetic head core in which a metal magnetic thin film is attached between a pair of half cores made of an oxide magnetic material, and a magnetic gap is formed between the metal magnetic thin films.
In particular, the present invention relates to an improvement in a magnetic head core of the type in which the thin film adhesion surface on which a metal magnetic thin film is attached and the magnetic gap are inclined.

“Prior art and its problems” Gold 1. A magnetic head core of the type in which the J1 magnetic thin film and the magnetic gap are inclined is proposed in Japanese Patent Laid-Open No. 80-32107. Figure 3 is a schematic perspective view.

On the abutting surfaces of a pair of half cores 11 made of oxide magnetic material such as ferrite, a thin film adhesion surface 13 is formed, which is inclined with respect to the magnetic gap 12 to be formed, with the 1-lower relationship reversed. A gold rtls magnetic n film 14 such as Sendust is deposited on the adhesion surface 13 by one step of thin film formation such as sputtering or vapor deposition. Further, the half core 11 is formed with a magnetic gap depth regulating surface 15 that is substantially perpendicular to the thin film attachment surface 13 . The magnetic gap 12 is formed between the end faces of a pair of metal magnetic thin films 14 that are inclined with respect to the thin film adhesion surface 13, and in the space between the V-shaped metal magnetic thin film 14 and the magnetic gap depth regulating surface 15, A non-magnetic oxide bonding material 1 (hereinafter referred to as glass) 16 such as glass is filled and a pair of half cores 11 are fixed. 17 is a coil three-wire groove.

In this magnetic head, since the boundary between the half core 11 and the thin film attachment surface 13, which may become a pseudo-gap, and the magnetic gap 12 are inclined, this pseudo-gap affects recording and reproduction by the magnetic gap 12. In addition, the width of the magnetic gap 12 can be made small to achieve high recording density. Further, since most of the tape sliding surface can be formed of the half core 11 and the glass 16, there are advantages such as excellent wear resistance.

By the way, this magnetic head has left and right /\-Fucoa 11.1
The bonding strength of 1 is mainly obtained by the glass 16. Since the glass 16 is an oxide, it is strongly bonded to the half core 11 made of oxide magnetic material, but the metal magnetic thin film 14
There was a problem in that the bonding strength was significantly reduced when bonded with. In other words, the magnetic head with the structure No. 42 has a metal magnetic thin film 1
4 and the glass 16, that is, the bonding strength between the left and right half cores 11, it was difficult to increase the bonding strength between the half cores 11 and the left and right half cores 11, and the reliability of the image magnetic head, which required a narrow gap interval as the magnetic gear knob 12, was impaired. .

``Object of the Invention'' The present invention solves the problems of the conventional products, and improves the bonding strength between the metal magnetic thin film and the glass in the magnetic head of the type described above, and further strengthens the left and right /\-fucores. The purpose is to provide a magnetic head core that can be coupled.

"Summary of the Invention" The present invention is based on the idea of interposing an intermediate layer with excellent bonding properties between a metal magnetic thin film and glass, and as a result of various research into an intermediate layer with excellent bonding properties to both. This was completed after discovering that an oxide film formed by oxidizing the metal magnetic thin film itself was effective. This oxide film can be formed by thermal oxidation, plasma oxidation, or chemical oxidation. However, in the case of heat treatment, there is no problem if only the metal magnetic thin film can be oxidized, but in actual heating operations, the entire half core, that is, the entire oxide magnetic material, tends to be heated; , its composition changes, making it impossible to obtain the desired performance. Therefore, in the present invention,
The f stage for obtaining an oxide film is performed by oxidation treatment other than heat treatment,
In other words, it is limited to chemical oxidation or plasma oxidation.

When an oxide film is formed on the surface of the metal magnetic thin film in this way, oxygen diffusion occurs between this oxide film and the glass laminated on this L, and as a result, the glass and the oxide film, that is, the half core, are firmly bonded. .

``Embodiments of the Invention'' The present invention will now be described with reference to illustrated embodiments. FIG. 1 is a schematic diagram of a magnetic head structure according to the present invention, in which an oxide film layer 20 formed by oxidizing a thin metal magnetic film 214 is interposed between the metal magnetic thin film 14 and the glass 16 of the left and right half cores 11. There is. The other structure is the same as that of the conventional product shown in FIG. 3, and the same parts are given the same reference numerals.

This oxidized 1112 layer 20 is preferably formed by plasma oxidation or chemical oxidation other than heat treatment.

Plasma oxidation is performed on the thin film attachment surface 131- of the half core 11.
After the metal magnetic thin film 14 is formed, plasma is irradiated onto the surface of the metal magnetic thin film 14 to oxidize it. In order to remove impurities at the grain boundaries, the metal magnetic thin film 14 is heated at 60 kW at as high a power as possible (for example, 800 to 2000 W). It is desirable to carry out the oxidation treatment for about a minute.

The thickness of this oxide film layer 20 is approximately 50 to 100.

Then, glass 16 is melted and filled between this oxide film layer 20 and the magnetic gap depth regulating surface 15 of the other nof core 11, and when the left and right half cores 11 are joined, the oxide film layer 20 is formed. Since oxygen diffusion occurs between the glass 16 and the glass 16, the two are firmly bonded. On the other hand, what is the glass 16 and the half core 11?

Since both are oxides, they are strongly bonded, so the left and right half cores 11 are firmly bonded as a whole. J
The magnetic gap 12 can be maintained as a narrow gear with high stability.

To this magnetic field, a coil is wound in the winding groove 17 of the core, and after polishing the sliding contact surface of the magnetic tape, the core is housed and fixed in a case to complete the magnetic head.

Next, an example of the manufacturing process of the magnetic head core shown in FIG. 1 will be explained with reference to FIG. 2. This manufacturing process is basically the same as the manufacturing process proposed in JP-A No. 60-32107, except that an oxidation treatment step is included in the middle. First, V)123 are formed at regular intervals on the abutting surfaces 22 of a pair of plate-shaped /\-fucoa blocks 21. This V-groove 23 constitutes the thin film adhesion surface 13 (see Figure (a)).
), the metal magnetic thin film 14 is deposited and formed on the entire surface of the abutting surface 22 and the V-groove 23 by a thin film forming means, and then the entire surface of the metal magnetic thin film 14 is subjected to oxidation treatment to form an oxide film layer. The oxidation treatment for forming 20 ((b)) is performed by plasma oxidation or chemical oxidation as described above.

After this oxidation treatment, the abutting surface 22 of the half core block 21 is polished to remove the metal magnetic wire v14 and the oxide film layer 20 in the portion other than the V-groove 23 ((C)), and then the adjacent V-groove 23 is removed. In the meantime, another V1+24 is formed (step (d)), and the glass 16 is filled in the V grooves 23 and 24, and then the abutting surface 22 is polished (step (e)). (2) The groove 24 constitutes the magnetic gap depth regulating groove 15.

Below 1. A pair of half core blocks 21 that have been cut
With a gap-forming material interposed on the surface, the end surfaces of the metal magnetic thin film 14 are butted together as shown in FIG. 3(f), and the two are bonded by heating to a temperature at which the glass 16 melts and softens. Thereafter, it is cut as shown by cutting line AA' to obtain the magnetic head core of FIG. 1 having one width t.

S is the cutting allowance.

"Effects of the Invention" As described in 1- below, the magnetic head core of the present invention includes a metal magnetic thin film forming a magnetic gap, and this metal magnetic rl: i:
In a magnetic head core where the surface to which the thin film is attached is inclined, an oxide film formed by oxidizing the metal magnetic thin film and a non-magnetic oxide bonding material for bonding the pair of half cores is used. Since the film is interposed, the oxide film and the non-magnetic oxide bonding material such as glass can be firmly bonded together by the oxygen diffusion phenomenon. Therefore, the bonding strength between the pair of half cores can be increased and the magnetic gap width can be kept narrow, making it possible to provide a highly reliable and high performance magnetic head 111 as an image magnetic head.

[Brief explanation of drawings]

FIG. 1 is a schematic perspective view showing an embodiment of the magnetic head core of the present invention, and FIGS. 2(a) to f) are schematic views showing an example of manufacturing the magnetic head core of FIG. 1. ,
3rd ri! J is a schematic perspective view of a conventional magnetism to which the present invention is applied. 11... Half core, 12... Magnetic gap, 13
... Thin film adhesion surface, 14... Metal magnetic thin 1 model, 15.
...Magnetic gap depth regulating surface, 16...Glass (non-magnetic oxide bonding material), 20...Oxide film layer, 21...
Half core block, 22... butting surface, 23.
...■Groove, 24...V groove. Patent applicant Alps Electric Co., Ltd. Agent Kunio Miura Shigeru Matsui Figure 1 Figure 3 Cause 2

Claims (1)

[Claims] (1) On the abutting surfaces of a pair of half cores made of oxide magnetic material, a thin film adhesion surface is formed that is inclined with respect to the magnetic gap to be formed between both half cores, and a metal magnetic thin film is adhered to this thin film adhesion surface. , the end faces of the metal magnetic thin film of a pair of half cores are butted against each other to form a magnetic gap, and the pair of half cores are made of non-magnetic oxide such as glass filled between the metal magnetic thin film of one half core and the end face of the other half core. In the magnetic head core bonded with a magnetic bonding material, an oxide film layer formed by oxidizing the metal magnetic material by an oxidation treatment other than heat treatment is interposed at the interface between the metal magnetic material and the non-magnetic oxide bonding material. A magnetic head core characterized by: